Professor Brian Cox experiences what a world without gravity would be like! He 'falls' from 15,000 ... This topic appears in OCR, Edexcel, AQA, WJEC KS3, KS4 and GCSE in England and Wales, CCEA ...

Like we measure length in metres, and mass in kilos, we measure energy in all its many forms in calories. But what does one calorie look like ... JEM STANSFIELD:'Gravity gives things potential ...